Only show expand / collapse icon on nodes with children
Correct unittest
Show expand symbol if a node is added in a node without icon
Merge pull request #316 from nsendetzky/master

Moves PHPExcel libary to own extension
Merge pull request #317 from nsendetzky/master

Implements factory for container and fixes used sites for containsStatus() search function
Merge pull request #281 from cookiekiller/remove_arrows_from_categories

Only shows expand / collapse icon on nodes with children
Fixes JSLint warnings